Well, there are subreddits for every possible interest (and fetish). I mean every single one. So, you could start with clicking “edit subscriptions” under “my subreddits” and check out some of the main ones. Or you could search for a topic and browse some of the subreddits that appear in the header above the results.

The problem with Reddit is that it appears to be unmoderated, so there are too many short comments and one-liners that don’t add anything to the discussion or any useful information, so it’s a time-waster.
But thanks, @hominid, I’ll try the subreddits and see that helps.

Yeah my buddies are bat shit crazy about reddit. I agree there are some interesting discussions, but my oh my… that layout… I mean my buddies just copy paste links to me like I understand how to read a reddit forum. They’ll go like…

“So true!” then they give me the link
then I click it and I’m like… “Which freaking comment is so true? there’s a thousand!” haha

I have been using reddit since 2006, so my perspective might be off when I say that I feel reddit is very intuitive and has a great design.
It is not without its problems, however. But those problems are mostly related to its size. As it has grown, it went from a relatively tiny, unknown place for geeks to one of the largest places on the internet.